Two weeks earlier, a 2-year-old girl fatally shot herself in Fayetteville, North Carolina, and the toddler's father faced involuntary manslaughter charges, police said.

In New Orleans, a 5-year-old girl died June 23 after she came into contact with a .38-caliber revolver and accidentally shot herself in the head while her mother was at a store, police said.

Last August, a 3-year-old boy in Dundee, Michigan, found a .40-caliber handgun belonging to a family friend on a closet floor in his home. He died after accidentally shooting himself in the head, police said.